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If config in admin is missing check if you have properly created bootstrap file in etc/modules. It's missing here, maybe this is the reason.

Also you are missing model declaration in config.xml

<default>
   <payment>
      <netregistry>
          <model>.....

Noticed you have double <default><payment><netregistry> nodes. Try to merge them. Try to add following code to your payment model

    public function isAvailable($quote = null)
    {
        return true;
    }

Display logic lies in Mage_Payment_Helper_Data method getStoreMethods. Try to debug this cycle.

If config in admin is missing check if you have properly created bootstrap file in etc/modules. It's missing here, maybe this is the reason.

Also you are missing model declaration in config.xml

<default>
   <payment>
      <netregistry>
          <model>.....

Noticed you have double <default><payment><netregistry> nodes. Try to merge them. 
Add following code to your payment model

    public function isAvailable($quote = null)
    {
        return true;
    }

Display logic lies in Mage_Payment_Helper_Data method getStoreMethods. Try to debug this cycle.

If config in admin is missing check if you have properly created bootstrap file in etc/modules. It's missing here, maybe this is the reason.

Also you are missing model declaration in config.xml

<default>
   <payment>
      <netregistry>
          <model>.....

Noticed you have double <default><payment><netregistry> nodes. Try to merge them.

If config in admin is missing check if you have properly created bootstrap file in etc/modules. It's missing here, maybe this is the reason.

Also you are missing model declaration in config.xml

<default>
   <payment>
      <netregistry>
          <model>.....

Noticed you have double <default><payment><netregistry> nodes. Try to merge them. Try to add following code to your payment model

    public function isAvailable($quote = null)
    {
        return true;
    }

Display logic lies in Mage_Payment_Helper_Data method getStoreMethods. Try to debug this cycle.

If config in admin is missing check if you have properly created bootstrap file in etc/modules. It's missing here, maybe this is the reason.

Also you are missing model declaration in config.xml

<default>
   <payment>
      <netregistry>
          <model>.....

If config in admin is missing check if you have properly created bootstrap file in etc/modules. It's missing here, maybe this is the reason.

Also you are missing model declaration in config.xml

<default>
   <payment>
      <netregistry>
          <model>.....

Noticed you have double <default><payment><netregistry> nodes. Try to merge them.